Siping is the process of cutting thin slits across the surface of a tire to improve traction for driving in snowy, wet or icy conditions. Siping can also help manage tire heat when the road is overly hot.
As a tire rolls, the sipes will open up to take in water and or snow and remove it from the contact patch of the tire.
The extra biting edges provided by the sipes enhances grip for a variety of driving situations, particularly in inclement weather. Manufacturer-created tire sipes vary in a variety of ways from aftermarket sipes. Instead of making a blade cut into the tread plates, they are made as part of the mold. The advanced molding process allows the manufacturer to build an internal structure that supports the tread block and increases the traction surface area.